1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WasmCallingConvention.h"
#if ENABLE(WEBASSEMBLY)
#include <wtf/NeverDestroyed.h>
namespace JSC::Wasm {
const JSCallingConvention& jsCallingConvention()
{
static LazyNeverDestroyed<JSCallingConvention> staticJSCallingConvention;
static std::once_flag staticJSCCallingConventionFlag;
std::call_once(staticJSCCallingConventionFlag, [] () {
staticJSCallingConvention.construct(Vector<JSValueRegs>(), Vector<FPRReg>(), RegisterSetBuilder::calleeSaveRegisters());
});
return staticJSCallingConvention;
}
const WasmCallingConvention& wasmCallingConvention()
{
static LazyNeverDestroyed<WasmCallingConvention> staticWasmCallingConvention;
static std::once_flag staticWasmCallingConventionFlag;
std::call_once(staticWasmCallingConventionFlag, [] () {
#if USE(JSVALUE64) // One value per GPR
constexpr unsigned numberOfArgumentJSRs = GPRInfo::numberOfArgumentRegisters;
#elif USE(JSVALUE32_64) // One value per consecutive GPR pair
constexpr unsigned numberOfArgumentJSRs = GPRInfo::numberOfArgumentRegisters / 2;
#endif
Vector<JSValueRegs> jsrArgumentRegisters(numberOfArgumentJSRs);
for (unsigned i = 0; i < numberOfArgumentJSRs; ++i) {
#if USE(JSVALUE64)
jsrArgumentRegisters[i] = JSValueRegs { GPRInfo::toArgumentRegister(i) };
#elif USE(JSVALUE32_64)
jsrArgumentRegisters[i] = JSValueRegs { GPRInfo::toArgumentRegister(2 * i + 1), GPRInfo::toArgumentRegister(2 * i) };
#endif
}
Vector<FPRReg> fprArgumentRegisters(FPRInfo::numberOfArgumentRegisters);
for (unsigned i = 0; i < FPRInfo::numberOfArgumentRegisters; ++i)
fprArgumentRegisters[i] = FPRInfo::toArgumentRegister(i);
RegisterSetBuilder scratch = RegisterSetBuilder::allGPRs();
scratch.exclude(RegisterSetBuilder::vmCalleeSaveRegisters().includeWholeRegisterWidth());
scratch.exclude(RegisterSetBuilder::macroClobberedGPRs());
scratch.exclude(RegisterSetBuilder::reservedHardwareRegisters());
scratch.exclude(RegisterSetBuilder::stackRegisters());
for (JSValueRegs jsr : jsrArgumentRegisters) {
scratch.remove(jsr.payloadGPR());
#if USE(JSVALUE32_64)
scratch.remove(jsr.tagGPR());
#endif
}
Vector<GPRReg> scratchGPRs;
for (Reg reg : scratch.buildAndValidate())
scratchGPRs.append(reg.gpr());
// Need at least one JSValue and an additional GPR
#if USE(JSVALUE64)
RELEASE_ASSERT(scratchGPRs.size() >= 2);
#elif USE(JSVALUE32_64)
RELEASE_ASSERT(scratchGPRs.size() >= 3);
#endif
staticWasmCallingConvention.construct(WTFMove(jsrArgumentRegisters), WTFMove(fprArgumentRegisters), WTFMove(scratchGPRs), RegisterSetBuilder::calleeSaveRegisters());
});
return staticWasmCallingConvention;
}
} // namespace JSC::Wasm
#endif // ENABLE(B3_JIT)
|
